题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201613-41562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201613-50653.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201613-42296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201613-59797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201614-57839.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201613-50653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201614-45633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201614-32989.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201614-78401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201613-50653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201615-36974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201614-45633.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201615-16527.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201615-64786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201616-82637.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201616-93895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201616-56881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201614-32989.png)
点评:典型题,思路明确,需要逐步进行线性运算,坐标运算,根据向量平行的条件,建立方程组求k。涉及向量模的计算,往往要注意“化模为方”,转化成向量的数量积。
核心考点
试题【 已知 (1)求;(2)当为何实数时,与平行, 平行时它们是同向还是反向?】;主要考察你对空间向量的直角坐标运算等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201606-77808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201606-36611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201606-30663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201607-88249.png)
A.![]() | B.![]() | C.2![]() | D.10 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201555-44718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201556-98946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201556-91056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201556-54024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201557-38382.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201557-54011.png)
(Ⅱ)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201557-73123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201557-46664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201558-67411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201551-75747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201551-23492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201551-14727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201552-75010.png)
A.3 | B.4 | C.5 | D.6 |
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201536-11330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201537-21671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201537-24097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201537-42193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201538-47380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105201538-36736.png)
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